Added Slack badge

Ali · Ali · commit e4d983c50481 · 2015-11-11T12:34:48.000+01:00
@cromwellryan updated to Slackin 0.6 and a Github employee cleared the cache of the SVG. Now it shows up correctly: [![Slack](https://ember-community-slackin.herokuapp.com/badge.svg)](https://ember-community-slackin.herokuapp.com) If it doesn't please clear your browser cache!
diff --git a/README.md b/README.md
@@ -1,4 +1,4 @@
-# Ember.js [![Build Status](https://secure.travis-ci.org/emberjs/ember.js.svg?branch=master)](http://travis-ci.org/emberjs/ember.js) [![Code Climate](https://codeclimate.com/github/emberjs/ember.js.svg)](https://codeclimate.com/github/emberjs/ember.js)
+# Ember.js [![Build Status](https://secure.travis-ci.org/emberjs/ember.js.svg?branch=master)](http://travis-ci.org/emberjs/ember.js) [![Code Climate](https://codeclimate.com/github/emberjs/ember.js.svg)](https://codeclimate.com/github/emberjs/ember.js) [![Slack](https://ember-community-slackin.herokuapp.com/badge.svg)](https://ember-community-slackin.herokuapp.com)
 [![Sauce Test Status](https://saucelabs.com/browser-matrix/ember-ci.svg)](https://saucelabs.com/u/ember-ci)
 
 

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-# Ember.js [![Build Status](https://secure.travis-ci.org/emberjs/ember.js.svg?branch=master)](http://travis-ci.org/emberjs/ember.js) [![Code Climate](https://codeclimate.com/github/emberjs/ember.js.svg)](https://codeclimate.com/github/emberjs/ember.js)`
	`1`	`+# Ember.js [![Build Status](https://secure.travis-ci.org/emberjs/ember.js.svg?branch=master)](http://travis-ci.org/emberjs/ember.js) [![Code Climate](https://codeclimate.com/github/emberjs/ember.js.svg)](https://codeclimate.com/github/emberjs/ember.js) [![Slack](https://ember-community-slackin.herokuapp.com/badge.svg)](https://ember-community-slackin.herokuapp.com)`
`2`	`2`	`[![Sauce Test Status](https://saucelabs.com/browser-matrix/ember-ci.svg)](https://saucelabs.com/u/ember-ci)`
`3`	`3`
`4`	`4`